coli is not significant with TC treatment. The PPT has the molecular formula of C 22H 22N 2O 9, and the exact mass is 458.44 g/mol. The mass spectra of PPT had characteristic ion signals in m/z 459, 445, and 249.1 Da. A photolysis product of TC (PPT) was generated in an alkaline solution after the illumination of a blue light. coli), were investigated during the photolysis of TC. coli), including that of a multidrug-resistant E. Especially, the inactivation of superoxide anion radicals (O 2 Chromatographic analyses and mass spectrometry were used to study the effects of the light illumination of a 462 nm light-emitting diode (LED) on the conformational changes of TC in a phosphate buffer solution (PBS, pH 7.8). Tetracycline (TC) is a broad-spectrum antimicrobial agent. The adaptability of bacterial resistance to antibiotics contributes to its high efficiency during evolution.
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